.page-about {
  --about-rail: 232px;
  --about-gap: clamp(28px, 4vw, 64px);
  --about-line: rgba(26, 21, 18, 0.14);
  --about-line-strong: rgba(26, 21, 18, 0.32);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: 20px;
}
.page-about .about-crumb .breadcrumb {
  margin: 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(24px, 4vw, 44px);
}
.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: end;
}
.page-about .about-hero__copy h1 {
  margin: 12px 0 0;
  font-size: clamp(28px, 5.2vw, 52px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--ink);
  max-width: 18ch;
}
.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}
.page-about .about-hero__frame {
  margin: 0;
}
.page-about .about-hero__frame img {
  width: 100%;
  height: auto;
  max-width: 100%;
  display: block;
  object-fit: cover;
}

/* ---------- 首屏数字 ---------- */
.page-about .about-facts {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border-top: 1px solid var(--about-line-strong);
}
.page-about .about-facts__item {
  background: var(--cream);
  padding: 14px 12px 14px 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.page-about .about-facts__num {
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  color: var(--red);
  letter-spacing: 0.02em;
}
.page-about .about-facts__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--warm);
}

/* ---------- 档案主体 ---------- */
.page-about .about-story {
  padding-top: clamp(36px, 6vw, 72px);
}
.page-about .about-story__layout {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
}

/* 左侧索引 */
.page-about .about-rail {
  min-width: 0;
}
.page-about .about-rail__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  border-top: 1px solid var(--about-line-strong);
}
.page-about .about-rail__item {
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-rail__item a {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  grid-template-rows: auto auto;
  column-gap: 10px;
  padding: 12px 0;
  text-decoration: none;
  color: var(--ink);
  position: relative;
  transition: background-color 0.2s ease, padding-left 0.2s ease;
}
.page-about .about-rail__item a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--red);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.24s ease;
}
.page-about .about-rail__item a:hover,
.page-about .about-rail__item a:focus-visible {
  background: rgba(215, 38, 61, 0.05);
  padding-left: 10px;
}
.page-about .about-rail__item a:hover::before,
.page-about .about-rail__item a:focus-visible::before {
  transform: scaleY(1);
}
.page-about .about-rail__no {
  grid-row: 1 / span 2;
  font-size: 13px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 0.06em;
  padding-top: 2px;
}
.page-about .about-rail__name {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.35;
}
.page-about .about-rail__hint {
  font-size: 12px;
  color: var(--warm);
  letter-spacing: 0.04em;
}
.page-about .about-rail__foot {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--warm);
}
.page-about .about-rail__foot a {
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 127, 143, 0.4);
}
.page-about .about-rail__foot a:hover {
  border-bottom-color: var(--teal);
}

/* ---------- 资料卡 ---------- */
.page-about .about-files {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(22px, 3vw, 36px);
}
.page-about .about-file {
  background: var(--cream);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--about-line-strong);
  border-radius: var(--radius);
  padding: clamp(20px, 3vw, 36px);
  scroll-margin-top: calc(var(--header-h) + 24px);
  transition: border-left-color 0.24s ease, box-shadow 0.24s ease;
}
.page-about .about-file:hover {
  border-left-color: var(--red);
  box-shadow: 0 10px 28px -22px rgba(26, 21, 18, 0.55);
}
.page-about .about-file:target {
  border-left-color: var(--red);
  background: var(--paper);
}
.page-about .about-file__head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
}
.page-about .about-file__head h2 {
  margin: 0;
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.34;
  color: var(--ink);
  max-width: 26ch;
}
.page-about .about-file__body {
  margin-top: 16px;
}
.page-about .about-file__body p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 68ch;
}
.page-about .about-file__body p:last-child {
  margin-bottom: 0;
}
.page-about .about-file__body a {
  color: var(--rust);
  text-decoration: none;
  border-bottom: 1px solid rgba(228, 87, 46, 0.42);
}
.page-about .about-file__body a:hover {
  border-bottom-color: var(--rust);
}
.page-about .about-file__figure {
  margin: 18px 0;
}
.page-about .about-file__figure img {
  width: 100%;
  height: auto;
  max-width: 100%;
  display: block;
  object-fit: cover;
}
.page-about .about-file__foot {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px dashed var(--about-line-strong);
  font-size: 14px;
  color: var(--warm);
}

/* 深色卡：焕新历程 */
.page-about .about-file--renewal {
  background: var(--ink-deep);
  border-color: transparent;
  border-left-color: var(--gold);
  color: var(--on-dark);
}
.page-about .about-file--renewal:hover {
  border-left-color: var(--red);
}
.page-about .about-file--renewal:target {
  background: var(--ink-deep);
  border-left-color: var(--red);
}
.page-about .about-file--renewal .about-file__head h2 {
  color: var(--cream);
}
.page-about .about-file--renewal .about-file__body p {
  color: var(--on-dark);
}
.page-about .about-file--renewal .about-file__body a {
  color: var(--gold);
  border-bottom-color: rgba(217, 164, 65, 0.45);
}

/* ---------- 指标条 ---------- */
.page-about .about-pulls {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border-top: 1px solid var(--about-line-strong);
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-pull {
  background: var(--cream);
  padding: 14px 10px 14px 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.page-about .about-pull__num {
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--teal);
}
.page-about .about-pull__txt {
  font-size: 12px;
  line-height: 1.5;
  color: var(--warm);
}

/* ---------- 整理流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  counter-reset: none;
}
.page-about .about-steps__item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--about-line);
  transition: background-color 0.2s ease;
}
.page-about .about-steps__item:last-child {
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-steps__item:hover {
  background: rgba(46, 127, 143, 0.06);
}
.page-about .about-steps__no {
  font-size: 13px;
  font-weight: 700;
  color: var(--teal);
  letter-spacing: 0.06em;
  padding-top: 2px;
}
.page-about .about-steps__item h3 {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}
.page-about .about-steps__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
}
.page-about .about-team__figure {
  margin: 0;
}
.page-about .about-team__figure img {
  width: 100%;
  height: auto;
  max-width: 100%;
  display: block;
  object-fit: cover;
}

/* ---------- 备案清单 ---------- */
.page-about .about-ledger {
  margin: 22px 0 0;
  border-top: 1px solid var(--about-line-strong);
}
.page-about .about-ledger__row {
  display: grid;
  grid-template-columns: minmax(88px, 30%) minmax(0, 1fr);
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-ledger__row dt {
  font-size: 13px;
  color: var(--warm);
  letter-spacing: 0.04em;
}
.page-about .about-ledger__row dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink);
}
.page-about .about-ledger__row dd.mono {
  font-weight: 700;
  letter-spacing: 0.02em;
}

/* ---------- 下一页区块 ---------- */
.page-about .about-next {
  padding-bottom: clamp(48px, 7vw, 96px);
}
.page-about .about-next__grid {
  margin-top: 20px;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border-top: 1px solid var(--about-line-strong);
  border-bottom: 1px solid var(--about-line-strong);
}
.page-about .about-next__card {
  background: var(--cream);
  padding: 22px 18px 22px 0;
  text-decoration: none;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
  transition: background-color 0.22s ease, padding-left 0.22s ease;
}
.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  background: var(--ink-deep);
  padding-left: 18px;
}
.page-about .about-next__card:hover .about-next__no,
.page-about .about-next__card:focus-visible .about-next__no {
  color: var(--gold);
}
.page-about .about-next__card:hover h2,
.page-about .about-next__card:focus-visible h2 {
  color: var(--cream);
}
.page-about .about-next__card:hover p,
.page-about .about-next__card:focus-visible p {
  color: var(--on-dark-soft);
}
.page-about .about-next__no {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--red);
}
.page-about .about-next__card h2 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  transition: color 0.22s ease;
}
.page-about .about-next__card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--warm);
  transition: color 0.22s ease;
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
  .page-about .about-story__layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
  }
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }
  .page-about .about-next__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 宽屏 ---------- */
@media (min-width: 1180px) {
  .page-about {
    --about-rail: 268px;
  }
}
<<<END>>>